As a FYI, here is the slip clutch on my tiller. Every spring I have to loosen all the bolts & springs holding it together. I then jam a couple 2x4s into the tines & fire up the PTO. With nothing but rust holding it together the clutch still transmits enough power to break 1 or 2 2x4s. Once it breaks free, you tighten it a little then fire up the PTO briefly to let it slip a bit & clean off the rust. Then tighten it back up to spec. If you don't do that at least once a year, it will be rusted solid & never slip when you need it to.
I was pissed my dealer sold me a sheet pin mower rather than the clutch based one I wanted. But I found that out a couple years after purchasing it & never doing the annual clutch maintenance. As I never sheered a pin, that was my far the least maintenance option & actually what I should have had. Sheer pins are only bad if you break them occasionally or frequently.
It may be of value to pull the sheer pin & make sure things aren't rusted solid. Depending on how you bent your shaft.
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